Hydraulic pump



B. E. FOLKE HYDRAULIC PUMP Feb 13, 1945 Filed May 27; 1944 4 Sheets-Sheet 2 BENT E. Fouaz FIG 3 IN VEN TOR.

n1 meme-H Feb. 13, 1945 I FOLKE 2,369,345

HYDRAULIC PUMP Filed May 27, 1 944 4 Sheets-Sheet 3 Bavar 5. Fame:

INVENTOR.

HTTOENEH waif/am A Feb. 13, 1945 Filed May 27, 1944 B. E. FOLKE HYDRAULIC PUMP 4 Sheets-Sheet 4 BENGT E. Fouzs INVENTOR.

BY fimi.

nrroemsr.

Patented Feb. 13, 1945 HYDRAULIC PUMP Bengt E. Folke, Mamaroneck, N. Y., assignor to Nathan Manufacturing Company, New York, N. Y a corporation of New York Application May 27,

20 Claims. The object of this invention is to provide new and useful improvements in hydraulic pumps having one or more pumping units adapted to deliver predetermined exact amounts of a fluid or for maintaining certain pressure conditions in one or more hydraulic lines, and which may be used as mechanical lubrica'tors, spinning pumps, or for similar purposes.

Another object is to provide means for changing the stroke of the individual pistons for the purpose of regulating the fluid discharge from each individual pumping unit or from all, pumping units as may be desired.

Another object is to provide means for the purpose of eliminating the use of lost motion for regulating the piston strokes.

A further object is to provide means to obtain sequential discharges from the pumping units for the purpose of distributing evenly the load on the actuating mechanism and to permit combining the discharges into a nearly constant fluid flow.

A still further object is to provide a compact pumping mechanism suitable for high pressures and high operating speeds.

Still further objects will become apparent in the following specification and in the drawings in which a preferred embodiment of the invention is shown.

In the drawings,

Fig. 1 is a longitudinal sectional view through the pump assembly;

Fig. 2 i a cross-sectional view along the plane of line 2-'-2 in Fig. 1;

Fig. 3 is a cross-sectional view along the plane of line 33inFig. 1;

Fig. 4 is a cross-sectional view along the Plane of linel-linFi'g. 1;

Fig. 5 is a cross-sectional view along ofline 55 inFig.1; and

Figs. 6 and '7 show fragmentary sectional views to illustrate theaction of the actuating parts in positions of minimum and maximum strokes, respectively.

Referring to Fig. 1, I0 is a pump body into which are fitted pistons II. The body II) is provided with an inlet l2 supplying liquid through a passage 13 to an annular well I. Each of the pistons is adapted to be rotated and reciprocated the plane in its cylinder by means described later in such a manner that a groove ii at the outside of the piston, forming a port with the cylinder wall, communicates alternately with an inlet passage l6 from the annular well ll during the intake or suction stroke and .with a dischargepassage ll during the pumping stroke. Groove II is in conpiston 1944, Serial No. 537,756 (01.103-457) stant communication through a cross duct lid of the, piston with a chamber below the piston formed by the piston cylinder, as shown in Figs. 1 5 and 4. The body I0 is provided with threaded outlets I8, each connected to a discharge passage 11.

The center of the pump body I0 is provided with a bearing sleeve l9 which supports a crank shaft 20. The crank shaft 20 is rotated by means of suitable gears comprising a worm wheel 2| on the shaft 20 and a worm 22 on a shaft 23 adapted to be driven from any suitable source of power. The upper end of the crank shaft 20 is provided with a crank pin 24 eccentrically'disposed with respect to the shaft. A disc 25 is oscillatingly mounted on the pin 24 and is secured in place by a screw 26 and a washer 21.

As shown in Fig. 3, the disc 25 is provided witha number of holes 28 which serve as bearings for off-set extensions or crank pins 29 of the pistons H. The eccentricity of the pins 29 with respect to the axes of pistons I I is the same as the eccentricity of the crank pin 24 in relation to the crank shaft 20. It will be seen, therefore, that rotation of the crank shaft 20 results in a corresponding rotation of the pistons II.

The crank pin 29 of each piston H terminates in a ball 30 which is universally coupled by means 30 of a rigid link 3| of fixed length with a ball a:

depending from a cylindrical block 33 carried by the pump body and normally displaced laterally with reference to the axis of the piston. Thelink 3| is provided with a socket at each end, one socket embracing ball 30 and the other socket ball 32. The hall 32 thus forms a fixed. universal pivot and-the ball 30 a movable eccentric unlversal pivot which are connected by the link or universal coupling 3! which maintains a constant linear distance between them. The block 33 is mounted directly on a screw 34 within a radial slot 35in a disc 36 secured to the pump body by means of a lock nut 38. A cover 39 encloses the regulating mechanism and is secured to the shelf 36 by a screw 40.

By referring to Fig. 6, it will be observed that when the regulating block -33 is located in a position so that the hall 32 is above and coaxial with the piston ll, rotation of the piston and a vertical duct l5b through the lower and means of screws 31. The lateral displacement of ll imparted to it by the oscillation of the disc 25 does not result in any reciprocating movement of the piston. By referring to Fig. '7, it will be noted that when the ball 32 is displaced a distance A from the center line or axis of thepiston l I, the piston will be reciprocated while it is. being rotated, due to the action of the link 3|, the crank pin 29 sliding axially in its bearing 28 in the disc 25. The amplitude of this reciprocation is a factor of the distance A, which is the lateral displacement of the block 33. Thus by adjusting the position of block 33, as previously explained, the stroke of the piston and .the discharge of the pump may be nicely regulated. It will be noted further that the movement imparted to the piston II will be free from lost motion regardless of whether or not the regulating block 33 is set forminimum or maximum discharge. It will also be apparent that ample bearing surfaces exist between the ball pins 30 and 32 and the link 3|, permitting operation with high pressures and at high speeds. It will also be clear that any desired sequence of operation between the several pistons may be obtained by positioning the slots 35 and the grooves IS in the pistons H and the inlet passages l6 and the discharge passages ll in any desired relation to each other. It is obvious, of course, that the pump can be provided with one or more outlets. By admitting fluid under pressure, the pump may be used as a motor, an expedient well known in the art.

Many other changes in the'form, proportion, combination of parts and minor details of construction may be resorted to without departing from the principles or sacrificing any of the advantages of the invention, as defined in the appended claims.

What I .claim'as new, is: i

1. In a pump, a cylinder having inlet and discharge passages, a rotary and reciprocatory piston within the cylinder, said piston having a groove in communication with the cylinder below the piston, means to bring said groove in alternate communication with said inlet and discharge passages, and means to vary the stroke of the piston including a regulating block, in spaced relation to said piston, an eccentric pin on the piston, a link connecting said block with the eccentric pin, and means "for laterally displacing the block with reference to the axis the piston.

2. In a pump, a cylinder having inlet and diston within the cylinder, said piston having a groove in communication with the cylinder below the piston, means to'bring said groove in alternate communication with said inlet and discharge passages, and means to vary the stroke of the pisto including a regulating block, in

spaced relation to said piston, an eccentric pin a groove in communication with the cylinder below the piston, means to bring said groove in alternate communication with said inlet and discharge passages, and means to vary the stroke of the piston including a support in spaced relation over said piston, a regulating block,'radially movable in said support with respect to the piston, an eccentric pin on the piston, a link connecting said block with the eccentric'pin, and means for laterally displacing the block, with reference to the axis of the piston.

4. In a pump, a cylinder having inlet and dis- 7 charge passages, a rotary and reciprocatory pismeans for laterally displacing the block in reference to the axis of the piston.

5. In a pump, a cylinder having inlet and discharge passages, a rotary and reciprocatory piston within the cylinder, said piston having a groove in communication with the cylinder below the piston, means to bring said groove in alternate communication withsaid inlet and discharge passages, aregfifating block, an eccentric pin on the piston, a link, and ball joints at both ends of the link connecting itwith, respectively, the said block and the said eccentric pin maintaining a constant linear distance-between them,

said block being laterally displaced with refer- I ence to the axis of the piston to reciprocate the piston while it is .being rotated.

6. In a pump, a cylinder having inlet and discharge passages, a piston within the cylinder,

said piston having a, groove in constant com- I munication with the cylinder below the piston charge passages, a rotary and reciprocatory pis- 4 and so disposed that it will be in alternate communication with said inlet and discharge passages, an oif-set extension to said piston eccentric with respect to its axis, a shaft, a crank pin on said shaft eccentric with respect to its axis, the eccentricity of said crank pin and said off-set extension being the same, a disc movably secured to said crank pin, said oif-set extension being movably fitted to said disc, whereby a revolution of said crank pin will effect an oscillation of said disc and a complete revolution of the piston during which the groove in the piston communicates alternately with said inlet and discharge pas-' sages, and means to reciprocate, the piston'in-. eluding a fixed block laterally displaced with,- reference to the piston axis and a link connecting said block with the oiI-set extension of the piston.

'1. In a pump, a cylinder having inlet and discharge passages, a piston within the cylinder, said piston having a groove i constant communication with the cylinder below the piston and so disposed that it will be in alternate communication with said inlet, and discharge passages, an ofl-set extension to said piston eccentric with respect to its axis, a shaft, a crank pin on said shaft eccentric with respect to its axis, the eccentricityof said crank pin and said of!- set'extension being the same, a disc movably secured to said crank pin, said off-set extension being movably fitted to said. disc, whereby a revolution of said crank pin will effect an oscillation of said disc and a complete revolution of the piston during which the groove in the piston communicates alternately with said inlet and discharge passages, means to reciprocate, and

adjust the travel of, the piston including a regulating block, in spaced relation to said piston. a

link connecting said block with theofl-set extension of the piston and means for laterally displacing the block with reference to the axis of the piston.

8. In a pump, a cylinder having inlet and discharge passages, a piston within the cylinder, said piston having a groove in constant communication with the cylinder below the piston v tion of said disc and a complete revolution of the piston during which the groove in the piston communicates alternately with said inlet and discharge passages, means to reciprocate, and

adjust the travel of, the piston including a regulating block, in spaced relation to said piston, a

link connecting said block with the off-set extension of the piston, and means for laterally and radially displacing the block with reference to the axis of thepiston, the distance between block and ofiset extension remaining constant.

9. In a pump, a cylinder having inlet and discharge passages, a piston within the cylinder, said piston having a groove in constant communicaticn with the cylinder below the piston and so disposed that it will be in alternate communication with said inlet and discharge passages, an ofi-set extension to said piston eccentrio with respect to its axis, a shaft, a crank pin on said shaft eccentric with respect to its axis, the eccentricity of said crank pin and said off-set extension being the same, a disc movably secured to said crank pin, said ofi-set extension being movably fitted to said disc, whereby a revolution of said crank pin will effect an oscillation of said disc and a complete revolution of the piston during which the groove in the pisto said disc, whereby a revolution of said crank pin will effect an oscillation of said disc and a complete revolution of each piston during which the groove in each piston communicates alternately with said passages, and means to reciprocate the pistons including for each piston a fixed block laterally displaced with reference to thepistonaxis, and a link connecting said block with the off-set extension of the piston.

, 11. In a'pump, a casing having an inlet and a plurality of outlets, a shaft, a crank. pin on said shaft eccentric with respect to its axis, a plurality of cylinders, annularly disposed around and parallel to said shaft, each cylinder having an inlet passage in communication with said crank extension, said off-set pin being movably' fitted to said disc, whereby a revolution of said crank pin will effect an oscillation of said disc and a complete revolution of each piston dur-' ing which the groove in each piston communicates alternately with said passages, and means to reciprocate, and adjust the travel of, the pistons, including foreach piston a regulating block, in spaced relation to the piston, a link connecting said block with the 'oiiset extension ton communicates alternately with said inlet and discharge passages, means to reciprocate,

and adjust the travel of, the piston including a I ends of the link connecting it with, respectively,

th said block and the ofi-set extension of said piston maintaining a constant linear distance between them, and means for laterally displacing the block with reference to the axis of the piston.

of the piston and means for laterally displacing the block with reference to the axis of the piston.

12. In a pump, a casing having an inlet and a plurality of outlets, a shaft, a crank pin on said shaft eccentric with respect to its axis, a plurality' of cylinders, annularly disposed around and parallel to said shaft, each cylinder havin an inlet passage in communication with said inlet and a discharge passage in communication theaxis of the piston, the eccentricity of said crank pin and said ofi-set extensions being the 10. In a pump, a casing having an inlet and a plurality of outlets, a shaft, a crank pin on said with one of said outlets, a piston in each of said cylinders, each piston having a groove in constant communication with the cylinder below the DlStOlI flnd so disposed that it will be in alternate, communication with said inlet passage and said discharge passage, an oil-set extension to cachof said pistons eccentric with respect to the axis ofthe piston, the-eccentricity of said crank pin and said off-set extensions being the same, a disc movably secured to said crank exsame, a disc movahly secured to said crank pin, said oil-set extensions being movably-iitted to said disc, whereby a revolution of said crank pin will effect an oscillation of said disc and a complete revolution of each piston during which the groove in each piston communicates alternately' with said passages, and means to reciprocate, and adjust the travel of, the pistons in the piston, the distance between block and offset extension remaining constant.

13. In a pump,a casing having an inlet and a plurality of outlets, a shaft, a crank pin on said shaft eccentric with respect to its axis, a

' plurality of cylinders, annularly disposed around and parallel to said shaft, each cylinder having tension, said ofi-set pin being movably fitted. u

,an inlet passage in communication with said inlet and a discharge passage in communication with one of said outlets, a piston in each,

crank pin, said ofi-set extensions being movably fitted to said disc, whereby a revolution of said crank pin will eflect an oscillation of said disc and a complete revolution of each piston during which the groove in each piston communicates alternately with said passages, and means to reciprocate, and adjust the travel of, the pistons including a support in the casing in spaced relation over the pistons, a regulating block for each piston radially movable in said support with respect to the piston, and a link connecting said unit with the ofi-set extension of the piston, and means for laterally displacing the block with reference to the axis of the piston.

14. In a pump, a casing having an inlet and a plurality of outlets, a shaft, a crank pin on said shaft eccentric with respect to its axis, a plurality of cylinders, annularly disposed around and parallel to said shaft, each cylinder having an inlet passage in communication with said ini let and a discharge passage in communication with one of said-outlets, a piston in each of said cylinders, each piston having .a groove in constant communication with the cylinder below the piston and so disposed that it will be in alternate communication with said inlet passage and said discharge passage, an off-set extension to each of said pistons eccentric with respect to the axis of the piston, the eccentricity of said crank pin and said off-set extensions being the same, a disc movably secured to said crank pin, said velf-set extensions being movably fitted to said disc, whereby a revolution of said crank pin will effect an oscillation of said disc and a complete revolution of each piston during which the groove in each piston communicates alternately with said passages, and means-to reciprocate, and adjust the travel of, the pistons including for each piston a regulating block, in. spaced relation to the piston, a link connecting said block with the offset extension of the piston, ball joints at both ends of the link connecting it with; respectively, the said block and the ofi-set extension of its piston maintaining a constant linear distance between them and means for laterally displacing the block with reference to the axis of the piston.

15. A pump comprising a cylinder having inlet and discharge passages, a rotary and reciprocatory piston in the cylinder having means for alternately placing the inlet and discharge passages in communication wfth the cylinder as the piston rotates, an eccentric pivot carried by the piston, afixed pivot laterally displaced with reference to the piston axis, a universal coupling, ball joints at both ends of said coupling connecting it with, respectively, said eccentric pivot and said fixed pivot, and means for rotating and thereby reciprocating the piston.

16. A pump comprising a cylinder having inlet and discharge passages, a rotary and reciprocatory piston, in the cylinder having means for alternately placing the inlet and discharge passages in communication with the cylinder as the piston rotates, an eccentric pivot carried by the piston, a fixed pivot laterally displaced with reference to the piston axis, a universal coupling between the pivots, means for rotating and thereby reciprocating the piston, and means for adjusting the lateral displacement of the fixed pivot to regulate the stroke of the piston.

17. A pump comprising .a cylinder having inlet and discharge passages, a rotary and reciproca tory piston in the cylinder having means for alternately placing the inlet and discharge passages in communication with the cylinder as the piston rotates, an eccentric pivot carried by the piston, a fixed pivot laterally displaced with reference to the piston axis, .a universal coupling between the pivots, and means for rotating and thereby reciprocating the piston, the rotating means making axially slidable driving contact with the piston, whereby lost motion is elimi-,- nated.

18. A pump comprising a cylinder having inlet and discharge passages, a. rotary and reciprocatory piston in the cylinder having means for alternately placing the inlet and discharge passages in communication with the cylinder as the piston rotates, an eccentri pivot carried by the piston, a fixed pivot laterally displaced with reference to the piston axis, a universal coupling between the pivots, means for rotating and thereby reciprocating the piston, and means for-ad justing the lateral displacement of the fixed pivot to regulate the stroke of the piston, the rotating means making axially slidable driving contact with the piston.

19. A pump comprising a casing having an inlet and a plurality of outlets, said casing having a chamber in communication with the inlet, a plurality of cylinders, each cylinder having an inlet passage in communication with said chamber and a discharge passage in communication with one of 'said outlets, a rotary and reciprocatory piston in each cylinder having means for alternately placing said inlet passage and said discharge passage in communication with the cylinder as the piston rotates, an eccentric pivot carried by each piston, a fixed pivot for each piston laterally displaced with reference to the piston axis, a universal coupling between each fixed and eccentric pivot, and means for rotating and thereby reciprocating the pistons.

20. A pump comprising a casing having an inlet and a plurality of outlets, a plurality of cylinders, each cylinder having an inlet passage in communication with said inlet and a discharge passage in communication with one of said outlets, a rotary andreciprocatory piston in each cylinder having means for alternately placing said inlet passage and said discharge passage in communication with the cylinder as the piston rotates, an eccentric pivot carried by each piston,

a fixed pivot for each piston laterally displaced with reference to the piston axis, a universal coupling between each fixed and eccentric pivot, means for rotating and thereby reciprocating the pistons, and means for adjusting the lateral dis- I t- QEBTIFICAIE oF' cofiREc'rIbm Patent N .569 5h5- j t Fehm yla' a 19 5-.

' BEIfIGT EL'F L E. A

It is rieieb ceftified that ei'ro'r a eai' in the printd's pecifitation' of the above numbered patent requiring correction as follows: Page 2, s;ec-- 0nd column, li rie 51,, gfterfireciproqa'te", strike but thecomma; 1.1.119 6 1,

afterfinltstrike out the comma; page 3, first d qlumn, lln'e'z and 566-;

ondcqlumn, 11pes 57 and 66,af"t'er "piatbn" insert'a co mna; samef page. first qolumn' lin'es' 71;. and 75, and secondfqblumln; Line '27, for "extension; 3am

offfse t pin" read. --p1n, sa1 d off-set extent1ons-.-{; jpa gel+, f rst column,

1 1119'22, after-"piston," strike out and"; 11m 6, arter.".'m insertaf comma; and fliat the said Letters Patent should be rlqad with this qorrect'ibn therein that the me mafgbnfqrmtp the recoi dpif' flte casq in" thq-Ptent- Offioet I 1 1 r I Signed e 'ealecifth i jtr itday of Apr11,"A. 1 

